-54=3(7r+6)+6(3-6r)

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Solution for -54=3(7r+6)+6(3-6r) equation:


Simplifying
-54 = 3(7r + 6) + 6(3 + -6r)

Reorder the terms:
-54 = 3(6 + 7r) + 6(3 + -6r)
-54 = (6 * 3 + 7r * 3) + 6(3 + -6r)
-54 = (18 + 21r) + 6(3 + -6r)
-54 = 18 + 21r + (3 * 6 + -6r * 6)
-54 = 18 + 21r + (18 + -36r)

Reorder the terms:
-54 = 18 + 18 + 21r + -36r

Combine like terms: 18 + 18 = 36
-54 = 36 + 21r + -36r

Combine like terms: 21r + -36r = -15r
-54 = 36 + -15r

Solving
-54 = 36 + -15r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '15r' to each side of the equation.
-54 + 15r = 36 + -15r + 15r

Combine like terms: -15r + 15r = 0
-54 + 15r = 36 + 0
-54 + 15r = 36

Add '54' to each side of the equation.
-54 + 54 + 15r = 36 + 54

Combine like terms: -54 + 54 = 0
0 + 15r = 36 + 54
15r = 36 + 54

Combine like terms: 36 + 54 = 90
15r = 90

Divide each side by '15'.
r = 6

Simplifying
r = 6

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